zfs discuss - Jun 2007 - creating pool on slice which is mounted

partition> p
Current partition table (original):
Total disk cylinders available: 49771 + 2 (reserved cylinders)

Part      Tag    Flag     Cylinders         Size            Blocks
7       home    wm    3814 - 49769       63.11GB    (45956/0/0) 132353280

--- If i run the command zpool create <pool name>  <7th slice>
(shown above which is mounted as home), will it cause any harm to the existing
contents in home.

- Satish
 
 
This message posted from opensolaris.org

On Thu, 2007-06-21 at 06:16 -0700, satish s nandihalli
wrote:
> Part      Tag    Flag     Cylinders         Size            Blocks
> 7       home    wm    3814 - 49769       63.11GB    (45956/0/0) 132353280
> 
> --- If i run the command zpool create <pool name>  <7th slice>
(shown
> above which is mounted as home), will it cause any harm to the
> existing contents in home.
If you use "zpool create -f <pool name> <7th slice>", yes,
it''ll destroy
the filesystem that''s on that slice and you won''t be able to
access any
of the data presently on it.

If you do "zpool create pool <7th slice>"

where <slice> has a UFS filesystem, and is mounted, it should print an
error message, saying that

a) there''s a filesystem present
b) it''s mounted

 - so you need to unmount it, and use the -f flag.

	cheers,
			tim

In more detail:

(snip newfs of c2t1d0s1 to put a UFS filesystem on it)

# mount /dev/dsk/c2t1d0s1 /tmp/a
# zpool create pool c2t1d0s1
invalid vdev specification
use ''-f'' to override the following errors:
/dev/dsk/c2t1d0s1 is currently mounted on /tmp/a. Please see umount(1M).
# umount /tmp/a
#  zpool create pool c2t1d0s1
invalid vdev specification
use ''-f'' to override the following errors:
/dev/dsk/c2t1d0s1 contains a ufs filesystem.
# zpool create -f pool c2t1d0s1
# 

-- 
Tim Foster, Sun Microsystems Inc, Solaris Engineering Ops
http://blogs.sun.com/timf